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Stock-Based Compensation Plans (LTIP Performance-Based Stock Option Activity) (Details) - LTIP Performance-Based Stock Options [Member] $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
May 31, 2024 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding, Beginning balance, Shares subject to options | shares | 0.4 |
Exercised, Shares subject to options | shares | (0.1) |
Outstanding, Ending balance, Shares subject to options | shares | 0.3 |
Exercisable, Shares subject to options | shares | 0.3 |
Outstanding, Beginning balance, Weighted-average exercise price per share | $ / shares | $ 60.51 |
Exercised, Weighted-average exercise price per share | $ / shares | 58.98 |
Outstanding, Ending balance, Weighted-average exercise price per share | $ / shares | 60.86 |
Exercisable, Weighted-average exercise price per share | $ / shares | $ 60.86 |
Outstanding, Weighted-average remaining contractual term (years) | 2 years 1 month 6 days |
Exercisable, Weighted-average remaining contractual term (years) | 2 years 1 month 6 days |
Outstanding, Aggregate intrinsic value | $ | $ 20.9 | [1]
Exercisable, Aggregate intrinsic value | $ | $ 20.9 | [1]
[1] | Shares valued at the market price of the underlying stock as of May 31, 2024 less the exercise price.

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